Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Hi i own a chamberlain lif master gargae door opener 1/2 hp. For some reaon when i press the gargae door to close the garage it closes all the way and then opens as soon as it closes it does not wna stay closed. Help please

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  • Master
  • 512 Answers

Check the electronic eyes down on sides near tracks, make sure they are pointed at each other. Also clean the eye on them, just wipe off. If this doesnt work then make sure all bolts are tight, on door and opener,including all rollers, something loose will cause this problem. Next try adjusting the the adjustment screws on the opener main body, mark where they are and count turns as you go. The pressure may be to much and door goes back up, also check all around door to make sure nothing in interfering with door. Last thing is that the chain or belt may have slipped causing door to come out of alignment, making the door go down to far. You can tell by opening door up all the way and seeing if it did go up all the way, if not adjust belt or chain so door goes all the way up. I am telling everyway possible to fix the problem. Without seeing I cant tell you which one it is. You shouldnt have to buy any parts to fix, it is something to do with adjustment.

Posted on Jul 27, 2009

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Posted on Jan 02, 2017

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1 Answer

My garage door is a chamberlain lift master. We had to pull the latch and manually close it last week. When I opened it, my super-strength:) threw it open too fast and I think I threw off the main drive...


No need to - the unit has adjustments to control where the door stops on closing. You need to back off a tad on the closing setting so that the door stays closed.

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Check the door sensors. Make sure they are pointed at one another and the small light on each one is lit and not flickering. Tweak them a little. If you cannot get both lights to come on you have bad sensors.

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Hi. I have seen this before, although usually not from chamberlain garage door openers.

Pull the release cord that unlocks the door from the opener, and manually open the door ALL the way open.

Then lock back in place in the open position.

Then use automatic opener to shut door.

It will close very slowly, but should close all the way.

Then, open the door again using the remote, and the door will once again open slowly, this time it should open all the way.

Then close door with remote, and door should now close as it is supposed, with the proper speed.

The slow opening and shutting is the system position sensor resetting itself.

This is why your door is acting up.

I would also look up by the belt drive connects to the front of the garage door opening, to make sure there isn't any dirt, cobwebs, or other obstructions on the sensor that may cause it to re-close the way it does.

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Most likely your door sensors are out of alignment. Make sure they are pointed directly at one another.

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Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain enough to free the trolley and then run the opener until the door is closed. While the door is closed locate the 'up limit' on the side of the motor unit and turn this control 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

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Check your door sensors. Make sure the small light on each one is lit and not flickering ever so slightly. Tweak them a bit.

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check that lenses on safety beams are clean and that they are aimed at each other so that both have led light on.

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is chain moving. if not, gears are shot. if moving, is trolley connected.

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trolley is not attatced to the chain, grab that red rope that is hanging down and give it a ****. run the door up until it re-locks onto they trolley

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